Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08a4421160e9406…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 23:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ffc949181dbf384aed185eea3f74540 SHA-1: 700bd695263b1a979d1458c3105a260c54e4db31 SHA-256: e08a4421160e9406a02811005caadd7bc8e032fd4d040d8366457f00cd6fec19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as having duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.taxivanclass.com/uploads/ckfinder/files/76248641928.pdf In PDF document text
    • http://divapharma.com/uploaded/file/40657481119.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/gemagepunorumazelexabunam.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ac53a62389cf02d0c5de06b0194ae275/sogokafapinorasibedufe.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086752eeb4e8---luwofurebi.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/89923258882.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kularatejibupe.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/76055922502.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8ddf499c663961379ae72beed2114248/68065839381.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/74876189555.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/dupawapomesawev.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/16a8734c21bf3c6a4e10474a6da3375a/fuwuregisavepelalunujigod.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210818_173345.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c862ab08ffc---96694256742.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/68056030276.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091492340bf4---73542116853.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2eed11c8cde4b02a3487cb91d2f4bd2c/11136137336.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/77062088788.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/51310809505.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/80a16449497930f667d90079d76db582/46541259579.pdfIn PDF document text
    • http://hijoin.hu/editor_up/ganar.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/bepenadesunifa.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/1572103523.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/lunewej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pneumonia+adquirida+comunidade+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 18360 bytes
SHA-256: ebb44b27806943065aad6e684df0c65cb9461cc8d9bcd1faf59d2bb158c4e90e
font_01_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10716 bytes
SHA-256: 58e8b779afc4b8199fdb754dd2aeb57ac22653f9fb31fb53c48e6a03adde4f5e
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1